I'm sure the Tesla Powerwall is a great product, and the integration is interesting...
My solar system is different:
- three phase power (when we first installed ducted air con 20 years ago, you couldn't get a single phase system with the power we have... now you can)
- Fronius inverter
- Fronius WattPilot EVSE (charger)
- BYD battery (19.3kWh).
I went this way because it was no more expensive than a solution with Powerwall, it offers backup on all three phases, and I got roughly 50% more storage.
The configuration was a bit more complex (mainly done by the installer, but I sorted the WattPilot), but the integration is great. With ANY EV that I plug in, I have the WattPilot set up to use excess solar. Charging starts when the house battery is full and there's at least 1.4kW spare. Charge rate modulates in line with available energy (allows for clouds, loads in the house, whatever). It's working really well.
A day last week:
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